Add "previewing on hover" support for single-field autocomplete input

components/autofill/core/browser/autofill_external_delegate.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_EXTERNAL_DELEGATE_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_EXTERNAL_DELEGATE_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 27 matching lines @@
   // AutofillDriver.
   AutofillExternalDelegate(AutofillManager* autofill_manager,
                            AutofillDriver* autofill_driver);
   virtual ~AutofillExternalDelegate();
 
   // AutofillPopupDelegate implementation.
   virtual void OnPopupShown() OVERRIDE;
   virtual void OnPopupHidden() OVERRIDE;
   virtual bool ShouldRepostEvent(const ui::MouseEvent& event) OVERRIDE;
   virtual void DidSelectSuggestion(int identifier) OVERRIDE;
+  virtual void
+      DidSelectAutocompleteSuggestion(const base::string16& value) OVERRIDE;
   virtual void DidAcceptSuggestion(const base::string16& value,
                                    int identifier) OVERRIDE;
   virtual void RemoveSuggestion(const base::string16& value,
                                 int identifier) OVERRIDE;
   virtual void ClearPreviewedForm() OVERRIDE;
+  virtual void ClearAutocompletePreviewedField() OVERRIDE;
 
   // Records and associates a query_id with web form data.  Called
   // when the renderer posts an Autofill query to the browser. |bounds|
   // is window relative. |display_warning_if_disabled| tells us if we should
   // display warnings (such as autofill is disabled, but had suggestions).
   // We might not want to display the warning if a website has disabled
   // Autocomplete because they have their own popup, and showing our popup
   // on to of theirs would be a poor user experience.
   virtual void OnQuery(int query_id,
                        const FormData& form,
@@ skipping 99 matching lines @@
   std::vector<base::string16> data_list_labels_;
 
   base::WeakPtrFactory<AutofillExternalDelegate> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AutofillExternalDelegate);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_EXTERNAL_DELEGATE_H_